Extensible shore power box with phase judgment function for connecting multiple shore power cables
By designing an expandable shore power box for connecting multiple shore power cables, independent protection and phase sequence/phase determination for each cable are achieved, eliminating the risk of errors during the wiring process of multiple shore power cables, supporting multi-mode use and scalability, and meeting different power requirements.
Patent Information
- Application Number
- CN202423195463.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Existing technologies are insufficient to effectively manage and protect the phase and phase sequence of multiple shore power cables, resulting in a high risk of errors during wiring and an inability to meet the power supply needs of ships with high power and high power requirements.
Design an expandable shore power box for connecting multiple shore power cables, including power supply lines, basic shore power lines and extension lines, equipped with phase sequence and phase protection relays and circuit breakers to achieve independent protection and judgment, and have phase sequence identification and phase identification functions.
It reduces the risk of wiring errors, supports multiple modes of use, is expandable, and can connect different numbers of shore power cables as needed to meet different power requirements and avoid accidents.
Smart Images
Figure CN223797773U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electronic circuit field, concretely relates to a kind of for connecting multiple shore power cable with phase judgment extensible shore power box. BACKGROUND
[0002] In order to the requirement of energy conservation and environmental protection, ship is recommended not to use its diesel generator when stopping at port, but is directly connected to the power supply system on land, uses the power provided by land to meet the power demand on ship, such as lighting, air conditioning, refrigeration, loading and unloading goods etc..With the increasing of new energy ship, some need to charge power supply and daily power supply for battery on ship by alternating current shore power, the shore power required by these use scenarios is large, and multiple shore power cables are needed to be connected when ship is connected to shore power to ensure sufficient power. SUMMARY
[0003] In view of the deficiency of prior art, the utility model discloses a kind of for connecting multiple shore power cable with phase judgment extensible shore power box, each shore power cable is independently protected, and the extension shore power cable has phase judgment.
[0004] The technical scheme adopted by the utility model is as follows:
[0005] A kind of for connecting multiple shore power cable with phase judgment extensible shore power box, including power supply line, basic shore power line, extension line and extension line relay;
[0006] The extension line relay includes extension circuit coil and extension switch;When basic shore power line works, the extension circuit coil is powered, and the extension switch is closed;
[0007] The extension line includes control transformer, cable connection end and extension protection circuit;
[0008] The extension protection circuit includes phase sequence protection relay, phase protection relay, undervoltage protection coil and shore power main switch;The undervoltage protection coil is powered, and the shore power main switch is closed;
[0009] Phase sequence protection relay includes phase sequence signal sensing element and phase sequence protection switch;The phase sequence protection switch is single-blade double-throw switch;Phase protection relay includes phase signal sensing element and phase protection switch;
[0010] The switch blade of phase sequence protection switch, the first throw point of phase sequence protection switch and phase sequence error indicating lamp are connected in series as first monitoring branch;The second throw point of phase sequence protection switch and phase sequence correct indicating lamp are connected in series as second monitoring branch;Undervoltage protection coil, phase protection switch and the extension switch are connected in series as third monitoring branch;Third monitoring branch is connected in parallel with phase sequence correct indicating lamp.
[0011] A further technical solution is that the extended protection circuit also includes a shore power closing indicator light, shore power auxiliary contacts, a phase protection circuit control coil, and a phase protection circuit control switch; when the phase protection circuit control coil is energized, the phase protection circuit control switch closes; when the undervoltage protection coil is energized, both the shore power main switch and the shore power auxiliary contacts close.
[0012] The shore power auxiliary contact is a single-pole double-throw switch. The switch blade, the first throw, and the shore power closing indicator light of the shore power auxiliary contact are connected in series to form the fourth monitoring branch. The two ends of the fourth monitoring branch are connected in parallel to the secondary side of the control transformer. The second throw and the phase protection circuit control coil are connected in series to form the fifth monitoring branch. The fifth monitoring branch is connected in parallel to the shore power closing indicator light.
[0013] The phase protection circuit control switch is connected in series with the phase signal sensing element.
[0014] A further technical solution includes a phase error indicator light connected in parallel to the phase protection relay.
[0015] A further technical solution is that the power supply line has three phases; there are three phase protection relays; a corresponding phase signal sensing element is connected in series between the power supply line and cable connection terminals of each phase; and the three phase protection switches are all connected in series in the third monitoring branch.
[0016] A further technical solution is that there are multiple extension lines; when the extension circuit coil is energized, the multiple extension switches are closed.
[0017] A further technical solution is that the basic shore power line includes a control transformer, cable connection terminals, and basic protection circuits;
[0018] The basic protection circuit includes a phase sequence protection relay, an undervoltage protection coil, a shore power main switch, and shore power auxiliary contacts; when the undervoltage protection coil is energized, the shore power main switch and the shore power auxiliary contacts are closed.
[0019] The phase sequence protection relay includes a phase sequence signal sensing element and a phase sequence protection switch; the phase sequence protection switch is a single-pole double-throw switch;
[0020] The shore power main switch is connected in series between the power supply line and the cable connection end; the primary side of the control transformer is connected to the cable connection end; the phase sequence signal sensing element is connected to the primary side of the control transformer.
[0021] The phase sequence protection switch's switch blade, the first throw point of the phase sequence protection switch, and the phase sequence error indicator are connected in series to form the first monitoring branch; the second throw point of the phase sequence protection switch and the phase sequence correct indicator are connected in series to form the second monitoring branch; the undervoltage protection coil is the third monitoring branch; the third monitoring branch is connected in parallel with the phase sequence correct indicator; the shore power auxiliary contact and the extension circuit coil are connected in series to form the fourth monitoring branch; the two ends of the extension circuit coil are also connected in parallel to the shore power closing indicator.
[0022] A further technical solution involves connecting a power indicator light in parallel on the secondary side of the control transformer.
[0023] The beneficial effects of this utility model embodiment are as follows:
[0024] This utility model embodiment can be used in multiple modes. Each shore power cable is equipped with an independent circuit breaker for protection. When the ship is on watch and only low power is required, the shore power cables can be connected to the basic shore power box, saving manpower. When there is work equipment or high power charging demand, multiple shore power cables can be connected to multiple extension shore power boxes simultaneously. The specific number of shore power box cables can be set according to the power load calculation of the design unit for watch mode, work mode, berthing operation mode, etc.
[0025] The shore power box of this utility model embodiment has a parallel connection function. When expansion is required in the future, several identical expansion shore power boxes can be made to achieve the expansion, while the basic shore power box does not need to be removed, thus avoiding waste.
[0026] The shore power box of this utility model has phase sequence identification and phase identification functions. When connecting multiple shore power cables, this utility model eliminates the influence of personnel and environment during the wiring process and reduces the risk of errors because each shore power cable is equipped with an independent circuit breaker, phase sequence and phase detection. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the basic shore power line in an embodiment of this utility model.
[0028] Figure 2 This is a schematic diagram of the extension circuit in an embodiment of this utility model. Detailed Implementation
[0029] The specific embodiments of this utility model are described below with reference to the accompanying drawings.
[0030] An expandable shore power box for connecting multiple shore power cables with phase detection includes a power supply line, a basic shore power line, an extension line, and an extension line relay. The power supply line has three phases: A, B, and C.
[0031] Figure 1 This is a schematic diagram of the basic shore power line in an embodiment of this utility model.
[0032] like Figure 1 As shown, the basic shore power line includes cable connection terminal SC, control transformer T, and basic protection circuit.
[0033] like Figure 1 As shown, the basic protection circuit includes a phase sequence protection relay, which comprises a phase sequence signal sensing element P1 and a phase sequence protection switch P1-1. The phase sequence protection switch P1-1 is a single-pole double-throw switch. When the phase sequence signal sensing element P1 detects a correct phase sequence, the switch of the phase sequence protection switch P1-1 is connected to the second throw point; when the phase sequence signal sensing element P1 detects an incorrect phase sequence, the switch of the phase sequence protection switch P1-1 is connected to the first throw point.
[0034] The basic protection circuit also includes an undervoltage protection coil MCCB, a shore power main switch MCCB-1, and a shore power auxiliary contact MCCB-2. When the undervoltage protection coil MCCB is energized, both the shore power main switch MCCB-1 and the shore power auxiliary contact MCCB-2 close.
[0035] The shore power main switch MCCB-1 is connected in series between the power supply line and the cable connection terminal SC. The primary side of the control transformer T is connected to the cable connection terminal SC. The phase sequence signal sensing element P1 is connected to the primary side of the control transformer.
[0036] The first monitoring branch is formed by connecting the switch blade of phase sequence protection switch P1-1, the first throw of phase sequence protection switch P1-1, and the phase sequence error indicator light in series (H2). The second throw of phase sequence protection switch P1-1 and the phase sequence correct indicator light (H3) in series. The undervoltage protection coil MCCB forms the third monitoring branch. The third monitoring branch is connected in parallel with the phase sequence correct indicator light (H3).
[0037] The extension line relay includes an extension line coil P2. The shore power auxiliary contact MCCB-2 and the extension circuit coil P2 are connected in series to form the fourth monitoring branch. A shore power closing indicator light H4 is also connected in parallel across the two ends of the extension circuit coil P2.
[0038] A power indicator light H1 is also connected in parallel on the secondary side of the control transformer T.
[0039] Figure 2 This is a schematic diagram of the extension circuit in an embodiment of this utility model.
[0040] Combination Figure 1 , Figure 2 The extension line relay also includes an extension switch P2-1. When the main shore power line is operational, the extension circuit coil P2 is energized, and the extension switch P2-1 closes. The extension line relay is used to ensure that the extension line is operational only after the main shore power line is operational.
[0041] like Figure 2As shown, the extended circuit includes a control transformer T, a cable connection terminal SC, and an extended protection circuit.
[0042] The extended protection circuit includes a phase sequence protection relay, a phase protection relay, an undervoltage protection coil MCCB, a shore power main switch MCCB-1, and a shore power auxiliary contact MCCB-2. When the undervoltage protection coil MCCB is energized, both the shore power main switch MCCB-1 and the shore power auxiliary contact MCCB-2 close.
[0043] The extended protection circuit also includes a shore power closing indicator light H4, a phase protection circuit control coil P4, and three phase protection circuit control switches P4-1, P4-2, and P4-3. When the phase protection circuit control coil P4 is energized, the three phase protection circuit control switches P4-1, P4-2, and P4-3 close.
[0044] The phase sequence protection relay includes a phase sequence signal sensing element P1 and a phase sequence protection switch P1-1. The phase sequence protection switch P1-1 is a single-pole double-throw switch. When the phase sequence signal sensing element P1 detects that the phase sequence is correct, the switch of the phase sequence protection switch P1-1 is connected to the second throw point; when the phase sequence signal sensing element P1 detects that the phase sequence is incorrect, the switch of the phase sequence protection switch P1-1 is connected to the first throw point.
[0045] A phase protection relay consists of a phase signal sensing element and a phase protection switch. The power supply line has three phases, A, B, and C, therefore corresponding to three phase protection relays. For each phase, a corresponding phase signal sensing element P31, P32, or P33 is connected in series between the corresponding phases of the power supply line and cable connection. When any one of the phase signal sensing elements P31, P32, or P33 determines the phase is correct, the corresponding phase protection switch P31-1, P32-1, or P33-1 will close; conversely, if any one of the phase signal sensing elements P31, P32, or P33 determines the phase is incorrect, the corresponding phase protection switch P31-1, P32-1, or P33-1 will open.
[0046] The switch blade of phase sequence protection switch P1-1, the first throw of phase sequence protection switch P1-1, and the phase sequence error indicator H2 are connected in series to form the first monitoring branch. The second throw of phase sequence protection switch P1-1 and the phase sequence correct indicator H3 are connected in series to form the second monitoring branch. The undervoltage protection coil MCCB, the three phase protection switches P31-1, P32-1, and P33-1, and the extension switch P2-1 are connected in series to form the third monitoring branch. The third monitoring branch is connected in parallel with the phase sequence correct indicator H3.
[0047] The shore power auxiliary contact MCCB-2 is a single-pole double-throw switch. The switch blade, the first throw point, and the shore power closing indicator light H4 of the shore power auxiliary contact MCCB-2 are connected in series to form the fourth monitoring branch. The two ends of the fourth monitoring branch are connected in parallel to the secondary side of the control transformer T. The second throw point and the phase protection circuit control coil P4 are connected in series to form the fifth monitoring branch. The fifth monitoring branch is connected in parallel to the shore power closing indicator light H4.
[0048] The phase protection circuit control switches P4-1, P4-2, and P4-3 correspond to the phase signal sensing elements P31, P32, and P33 connected in series in the three phases, respectively.
[0049] It also includes phase error indicator lights H5, H6, and H7, which correspond to the phase signal sensing elements P31, P32, and P33 connected in parallel to the three phases, respectively.
[0050] Combination Figure 1 , Figure 2 The working method of this utility model is as follows:
[0051] When a ship uses shore power, the shore power is connected to an onshore power room, and the ship power is connected to a shore power box.
[0052] When multiple shore power cables are connected, the onshore distribution box is designed with independent circuit breakers, phase sequence and phase detection for each cable. This eliminates the influence of personnel and the environment, and reduces the risk of errors.
[0053] If it is only for daily use of shore power, and there is no need for high-power access such as charging, it is only necessary to connect to the basic shore power line and connect the cable to the cable connection terminal SC.
[0054] If the phase sequence signal sensing element P1 determines that the phase sequence is incorrect, the switch knife of the phase sequence protection switch P1-1 is connected to the first throw point, and the phase sequence error indicator H2 illuminates. The undervoltage protection coil MCCB is not energized, and the cable is not connected to the power supply line.
[0055] If the phase sequence signal sensing element P1 determines that the phase sequence is correct, the switch knife of the phase sequence protection switch P1-1 is connected to the second throw point, the phase sequence error indicator H3 illuminates, the undervoltage protection coil MCCB is energized, the shore power main switch MCCB-1 and the shore power auxiliary contact MCCB-2 are both closed, and the cable is connected to the power supply line to provide the ship with daily shore power for its watchkeeping needs. At the same time, the shore power closing indicator H4 illuminates, and the extension circuit coil P2 is energized.
[0056] For higher power requirements, cable connection Figure 2 The cable connection terminal SC. In the existing technology, only phase sequence judgment is available, not phase judgment. If the shore power cable is connected to the terminal in the order of number 1, 2, 3, the sequence is correct, but the corresponding number of the terminal is connected incorrectly as 2, 3, 1, the phase sequence judgment is correct, but the phase is incorrect, and closing the circuit will cause a phase-to-phase short circuit.Figure 2 Phase signal sensing elements P31, P32, and P33 were added to determine whether the phase was connected incorrectly and to illuminate the corresponding phase error indicator lights H5, H6, and H7, or to sound a buzzer to alert the crew. The circuit breaker was also prohibited from being closed on the line, thus preventing accidents.
[0057] like Figure 2 As shown, when the cable is connected to the cable connection terminal SC, a phase sequence determination is first performed, as described above. If the phase sequence determination is incorrect, the switch knife of the phase sequence protection switch P1-1 is connected to the first throw, and the phase sequence error indicator H2 illuminates. The undervoltage protection coil MCCB is not energized. The shore power main switch MCCB-1 is disconnected, and the cable is not connected to the power supply line.
[0058] If the phase sequence is correctly determined, the switch of phase sequence protection switch P1-1 is connected to the second throw point, the phase sequence correct indicator H3 illuminates, and there is voltage across the third monitoring branch, closing the extension switch P2-1. Since the undervoltage protection coil MCCB is not energized, the switch of shore power auxiliary contact MCCB-2 is connected to the second throw point, energizing the phase protection circuit control coil P4. The three phase protection circuit control switches P4-1, P4-2, and P4-3 close, and all phase protection circuits are in a working state. At this time, the circuit determines the phase sequence.
[0059] When any of the phase signal sensing elements P31, P32, or P33 detects a phase error, the corresponding phase protection switches P31-1, P32-1, or P33-1 will open, and the corresponding phase error indicator lights H5, H6, and H7 will illuminate to alert the operator. The undervoltage protection coil MCCB will not be energized. The shore power main switch MCCB-1 will not close, and the cable will not be connected to the power supply line.
[0060] When all phase signal sensing elements P31, P32, and P33 determine that the phase is correct, the three phase protection switches P31-1, P32-1, and P33-1 will close, energizing the undervoltage protection coil MCCB and connecting the cable to the power supply line. The switch knife of the shore power auxiliary contact MCCB-2 is connected to the first throw point, and the shore power closing indicator H4 illuminates to indicate that the shore power is closed.
[0061] The diagram shows an extension line; multiple extension lines can be added to the system for higher power requirements. Figure 2 The circuit shown can be connected to multiple shore power sources, increasing its scalability. When the extension circuit coil P2 is energized, multiple extension switches P2-1 close, allowing multiple extension circuits to operate simultaneously for connecting multiple cables.
[0062] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. The present utility model can be modified in any form without departing from its basic structure.
Claims
1. A shore power connection box for connecting a plurality of shore power cables with phase determination, characterized in that The power supply circuit includes a basic shore power circuit, an extension circuit and an extension circuit relay; The extension circuit relay includes an extension circuit coil and an extension switch; when the basic shore power circuit is working, the extension circuit coil is powered, and the extension switch is closed; The extension circuit includes a control transformer, a cable connection end and an extension protection circuit; The extension protection circuit includes a phase sequence protection relay, a phase protection relay, an under-voltage protection coil and a shore power main switch; the under-voltage protection coil is powered, and the shore power main switch is closed; The phase sequence protection relay includes a phase sequence signal sensing element and a phase sequence protection switch; the phase sequence protection switch is a single-pole double-throw switch; the phase protection relay includes a phase signal sensing element and a phase protection switch; The switch blade of the phase sequence protection switch, the first throw point of the phase sequence protection switch and a phase sequence error indicator lamp are connected in series to form a first monitoring branch; the second throw point of the phase sequence protection switch and a phase sequence correct indicator lamp are connected in series to form a second monitoring branch; the under-voltage protection coil, the phase protection switch and the extension switch are connected in series to form a third monitoring branch; the third monitoring branch is connected in parallel with the phase sequence correct indicator lamp.
2. The shore power box with phase determination for connecting multiple shore power cables according to claim 1, characterized in that, The extension protection circuit further includes a shore power closing indicator lamp, a shore power auxiliary contact, a phase protection circuit control coil and a phase protection circuit control switch; when the phase protection circuit control coil is powered, the phase protection circuit control switch is closed; when the under-voltage protection coil is powered, the shore power main switch and the shore power auxiliary contact are both closed; The shore power auxiliary contact is a single-pole double-throw switch, the switch blade of the shore power auxiliary contact, the first throw point and the shore power closing indicator lamp are connected in series to form a fourth monitoring branch, and the fourth monitoring branch is connected in parallel across the secondary side of the control transformer; the second throw point and the phase protection circuit control coil are connected in series to form a fifth monitoring branch, and the fifth monitoring branch is connected in parallel with the shore power closing indicator lamp; The phase protection circuit control switch is connected in series with the phase signal sensing element.
3. The shore power box with phase determination and scalability for connecting multiple shore power cables according to claim 1, characterized in that, A phase error indicator lamp is further connected in parallel with the phase protection relay.
4. The shore power box with phase determination and scalability for connecting multiple shore power cables according to claim 1, characterized in that, The power supply circuit has three phases; the phase protection relay has three; a corresponding phase signal sensing element is connected in series between the power supply circuit and the cable connection end of each phase; the three phase protection switches are connected in series in the third monitoring branch.
5. The shore power box with phase determination and scalability for connecting multiple shore power cables according to claim 1, characterized in that, The extension circuit has multiple; the extension circuit coil is powered, and the multiple extension switches are closed.
6. The shore power box with phase determination and scalability for connecting multiple shore power cables according to claim 1, characterized in that, The basic shore power circuit includes a control transformer, a cable connection end and a basic protection circuit; The basic protection circuit includes a phase sequence protection relay, an under-voltage protection coil, a shore power main switch and a shore power auxiliary contact; the under-voltage protection coil is powered, and the shore power main switch and the shore power auxiliary contact are closed; The shore power main switch is connected in series between the power supply circuit and the cable connection end; the primary side of the control transformer is connected to the cable connection end; The phase signal sensing element is connected to the primary side of the control transformer; The under-voltage protection coil is the third monitoring branch; the shore power auxiliary contact and the extension circuit coil are connected in series to form a fourth monitoring branch; the extension circuit coil is further connected in parallel with the shore power closing indicator lamp across.
7. The shore power box with phase determination and scalability for connecting multiple shore power cables according to claim 1 or 2, characterized in that, A power supply indicator lamp is connected in parallel across the secondary side of the control transformer.